linux-kernel - Re: [PATCH] soc: ti: pruss: Avoid cast to incompatible function type

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Date:   Tue, 18 Apr 2023 11:44:55 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Simon Horman <horms@...nel.org>
Cc:     Nishanth Menon <nm@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] soc: ti: pruss: Avoid cast to incompatible function type

On Tue, Apr 18, 2023 at 01:41:48PM +0200, Simon Horman wrote:
> Rather than casting clk_unregister_mux to an incompatible function
> type provide a trivial wrapper with the correct signature for the
> use-case.
> 
> Reported by clang-16 with W=1:
> 
>  drivers/soc/ti/pruss.c:158:38: error: cast from 'void (*)(struct clk *)' to 'void (*)(void *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>          ret = devm_add_action_or_reset(dev, (void(*)(void *))clk_unregister_mux,
> 
> No functional change intended.
> Compile tested only.
> 
> Signed-off-by: Simon Horman <horms@...nel.org>

Reviewed-by: Nathan Chancellor <nathan@...nel.org>

> ---
>  drivers/soc/ti/pruss.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/soc/ti/pruss.c b/drivers/soc/ti/pruss.c
> index 6882c86b3ce5..e68441bd7b30 100644
> --- a/drivers/soc/ti/pruss.c
> +++ b/drivers/soc/ti/pruss.c
> @@ -38,6 +38,11 @@ static void pruss_of_free_clk_provider(void *data)
>  	of_node_put(clk_mux_np);
>  }
>  
> +static void pruss_clk_unregister_mux(void *data)
> +{
> +	clk_unregister_mux(data);
> +}
> +
>  static int pruss_clk_mux_setup(struct pruss *pruss, struct clk *clk_mux,
>  			       char *mux_name, struct device_node *clks_np)
>  {
> @@ -93,8 +98,7 @@ static int pruss_clk_mux_setup(struct pruss *pruss, struct clk *clk_mux,
>  		goto put_clk_mux_np;
>  	}
>  
> -	ret = devm_add_action_or_reset(dev, (void(*)(void *))clk_unregister_mux,
> -				       clk_mux);
> +	ret = devm_add_action_or_reset(dev, pruss_clk_unregister_mux, clk_mux);
>  	if (ret) {
>  		dev_err(dev, "failed to add clkmux unregister action %d", ret);
>  		goto put_clk_mux_np;
>